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class="sidebar-heading"><span>实战案例</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/ActualCombat/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>面试</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/interview/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>系统架构</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/framework/default.html" class="sidebar-link">关于我</a></li></ul></section></li></ul> </aside> <div><main class="page"> <div class="theme-default-content content__default"><h1 id="朋友去面试竟然栽在了thread类的源码上"><a href="#朋友去面试竟然栽在了thread类的源码上" class="header-anchor">#</a> 朋友去面试竟然栽在了Thread类的源码上</h1> <h2 id="前言"><a href="#前言" class="header-anchor">#</a> 前言</h2> <p>最近和一个朋友聊天，他跟我说起了他去XXX公司面试的情况，面试官的一个问题把他打懵了！竟然问他：你经常使用Thread创建线程，那你看过Thread类的源码吗？我这个朋友自然是没看过Thread类的源码，然后，就没有然后了！！！</p> <p>所以，我们学习技术不仅需要知其然，更需要知其所以然，今天，我们就一起来简单看看Thread类的源码。</p> <p><font color="#FF0000"><strong>注意：本文是基于JDK 1.8来进行分析的。</strong></font></p> <h2 id="thread类的继承关系"><a href="#thread类的继承关系" class="header-anchor">#</a> Thread类的继承关系</h2> <p>我们可以使用下图来表示Thread类的继承关系。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200321093521485.jpg" loading="lazy" class="lazy"></p> <p>由上图我们可以看出，Thread类实现了Runnable接口，而Runnable在JDK 1.8中被@FunctionalInterface注解标记为函数式接口，Runnable接口在JDK 1.8中的源代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@FunctionalInterface</span>
<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">abstract</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>Runnable接口的源码比较简单，只是提供了一个run()方法，这里就不再赘述了。</p> <p>接下来，我们再来看看@FunctionalInterface注解的源码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Documented</span>
<span class="token annotation punctuation">@Retention</span><span class="token punctuation">(</span><span class="token class-name">RetentionPolicy</span><span class="token punctuation">.</span>RUNTIME<span class="token punctuation">)</span>
<span class="token annotation punctuation">@Target</span><span class="token punctuation">(</span><span class="token class-name">ElementType</span><span class="token punctuation">.</span>TYPE<span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token annotation punctuation">@interface</span> <span class="token class-name">FunctionalInterface</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>可以看到，@FunctionalInterface注解声明标记在Java类上，并在程序运行时生效。</p> <h2 id="thread类的源码剖析"><a href="#thread类的源码剖析" class="header-anchor">#</a> Thread类的源码剖析</h2> <h3 id="thread类定义"><a href="#thread类定义" class="header-anchor">#</a> Thread类定义</h3> <p>Thread在java.lang包下，Thread类的定义如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Thread</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="加载本地资源"><a href="#加载本地资源" class="header-anchor">#</a> 加载本地资源</h3> <p>打开Thread类后，首先，我们会看到在Thread类的最开始部分，定义了一个静态本地方法registerNatives()，这个方法主要用来注册一些本地系统的资源。并在静态代码块中调用这个本地方法，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//定义registerNatives()本地方法注册系统资源</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">native</span> <span class="token keyword">void</span> <span class="token function">registerNatives</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">static</span> <span class="token punctuation">{</span>
    <span class="token comment">//在静态代码块中调用注册本地系统资源的方法</span>
    <span class="token function">registerNatives</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h3 id="thread中的成员变量"><a href="#thread中的成员变量" class="header-anchor">#</a> Thread中的成员变量</h3> <p>Thread类中的成员变量如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//当前线程的名称</span>
<span class="token keyword">private</span> <span class="token keyword">volatile</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span>
<span class="token comment">//线程的优先级</span>
<span class="token keyword">private</span> <span class="token keyword">int</span>            priority<span class="token punctuation">;</span>
<span class="token keyword">private</span> <span class="token class-name">Thread</span>         threadQ<span class="token punctuation">;</span>
<span class="token keyword">private</span> <span class="token keyword">long</span>           eetop<span class="token punctuation">;</span>
<span class="token comment">//当前线程是否是单步线程</span>
<span class="token keyword">private</span> <span class="token keyword">boolean</span>     single_step<span class="token punctuation">;</span>
<span class="token comment">//当前线程是否在后台运行</span>
<span class="token keyword">private</span> <span class="token keyword">boolean</span>     daemon <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token comment">//Java虚拟机的状态</span>
<span class="token keyword">private</span> <span class="token keyword">boolean</span>     stillborn <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token comment">//真正在线程中执行的任务</span>
<span class="token keyword">private</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">;</span>
<span class="token comment">//当前线程所在的线程组</span>
<span class="token keyword">private</span> <span class="token class-name">ThreadGroup</span> group<span class="token punctuation">;</span>
<span class="token comment">//当前线程的类加载器</span>
<span class="token keyword">private</span> <span class="token class-name">ClassLoader</span> contextClassLoader<span class="token punctuation">;</span>
<span class="token comment">//访问控制上下文</span>
<span class="token keyword">private</span> <span class="token class-name">AccessControlContext</span> inheritedAccessControlContext<span class="token punctuation">;</span>
<span class="token comment">//为匿名线程生成名称的编号</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">int</span> threadInitNumber<span class="token punctuation">;</span>
<span class="token comment">//与此线程相关的ThreadLocal,这个Map维护的是ThreadLocal类</span>
<span class="token class-name">ThreadLocal<span class="token punctuation">.</span>ThreadLocalMap</span> threadLocals <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">//与此线程相关的ThreadLocal</span>
<span class="token class-name">ThreadLocal<span class="token punctuation">.</span>ThreadLocalMap</span> inheritableThreadLocals <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">//当前线程请求的堆栈大小，如果未指定堆栈大小，则会交给JVM来处理</span>
<span class="token keyword">private</span> <span class="token keyword">long</span> stackSize<span class="token punctuation">;</span>
<span class="token comment">//线程终止后存在的JVM私有状态</span>
<span class="token keyword">private</span> <span class="token keyword">long</span> nativeParkEventPointer<span class="token punctuation">;</span>
<span class="token comment">//线程的id</span>
<span class="token keyword">private</span> <span class="token keyword">long</span> tid<span class="token punctuation">;</span>
<span class="token comment">//用于生成线程id</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">long</span> threadSeqNumber<span class="token punctuation">;</span>
<span class="token comment">//当前线程的状态，初始化为0，代表当前线程还未启动</span>
<span class="token keyword">private</span> <span class="token keyword">volatile</span> <span class="token keyword">int</span> threadStatus <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token comment">//由（私有）java.util.concurrent.locks.LockSupport.setBlocker设置</span>
<span class="token comment">//使用java.util.concurrent.locks.LockSupport.getBlocker访问</span>
<span class="token keyword">volatile</span> <span class="token class-name">Object</span> parkBlocker<span class="token punctuation">;</span>
<span class="token comment">//Interruptible接口中定义了interrupt方法，用来中断指定的线程</span>
<span class="token keyword">private</span> <span class="token keyword">volatile</span> <span class="token class-name">Interruptible</span> blocker<span class="token punctuation">;</span>
<span class="token comment">//当前线程的内部锁</span>
<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Object</span> blockerLock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//线程拥有的最小优先级</span>
<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">static</span> <span class="token keyword">int</span> MIN_PRIORITY <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token comment">//线程拥有的默认优先级</span>
<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">static</span> <span class="token keyword">int</span> NORM_PRIORITY <span class="token operator">=</span> <span class="token number">5</span><span class="token punctuation">;</span>
<span class="token comment">//线程拥有的最大优先级</span>
<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">static</span> <span class="token keyword">int</span> MAX_PRIORITY <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br></div></div><p>从Thread类的成员变量，我们可以看出，Thread类本质上不是一个任务，它是一个实实在在的线程对象，在Thread类中拥有一个Runnable类型的成员变量target，而这个target成员变量就是需要在Thread线程对象中执行的任务。</p> <h3 id="线程的状态定义"><a href="#线程的状态定义" class="header-anchor">#</a> 线程的状态定义</h3> <p>在Thread类的内部，定义了一个枚举State，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">enum</span> <span class="token class-name">State</span> <span class="token punctuation">{</span>
   <span class="token comment">//初始化状态</span>
    NEW<span class="token punctuation">,</span>
   <span class="token comment">//可运行状态，此时的可运行包括运行中的状态和就绪状态</span>
    RUNNABLE<span class="token punctuation">,</span>
   <span class="token comment">//线程阻塞状态</span>
    BLOCKED<span class="token punctuation">,</span>
   <span class="token comment">//等待状态</span>
    WAITING<span class="token punctuation">,</span>
    <span class="token comment">//超时等待状态</span>
    TIMED_WAITING<span class="token punctuation">,</span>
    <span class="token comment">//线程终止状态</span>
    TERMINATED<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p>这个枚举类中的状态就代表了线程生命周期的各状态。我们可以使用下图来表示线程各个状态之间的转化关系。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200321094423681.png" loading="lazy" class="lazy"></p> <ul><li><p>NEW：初始状态，线程被构建，但是还没有调用start()方法。</p></li> <li><p>RUNNABLE：可运行状态，可运行状态可以包括：运行中状态和就绪状态。</p></li> <li><p>BLOCKED：阻塞状态，处于这个状态的线程需要等待其他线程释放锁或者等待进入synchronized。</p></li> <li><p>WAITING：表示等待状态，处于该状态的线程需要等待其他线程对其进行通知或中断等操作，进而进入下一个状态。</p></li> <li><p>TIME_WAITING：超时等待状态。可以在一定的时间自行返回。</p></li> <li><p>TERMINATED：终止状态，当前线程执行完毕。</p></li></ul> <h3 id="thread类的构造方法"><a href="#thread类的构造方法" class="header-anchor">#</a> Thread类的构造方法</h3> <p>Thread类中的所有构造方法如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token string">&quot;Thread-&quot;</span> <span class="token operator">+</span> <span class="token function">nextThreadNum</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> target<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> target<span class="token punctuation">,</span> <span class="token string">&quot;Thread-&quot;</span> <span class="token operator">+</span> <span class="token function">nextThreadNum</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">AccessControlContext</span> acc<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> target<span class="token punctuation">,</span> <span class="token string">&quot;Thread-&quot;</span> <span class="token operator">+</span> <span class="token function">nextThreadNum</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> acc<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> group<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>group<span class="token punctuation">,</span> target<span class="token punctuation">,</span> <span class="token string">&quot;Thread-&quot;</span> <span class="token operator">+</span> <span class="token function">nextThreadNum</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> group<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>group<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> target<span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> group<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>group<span class="token punctuation">,</span> target<span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> group<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">,</span>
              <span class="token keyword">long</span> stackSize<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>group<span class="token punctuation">,</span> target<span class="token punctuation">,</span> name<span class="token punctuation">,</span> stackSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br></div></div><p>其中，我们最经常使用的就是如下几个构造方法了。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token string">&quot;Thread-&quot;</span> <span class="token operator">+</span> <span class="token function">nextThreadNum</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> target<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> target<span class="token punctuation">,</span> <span class="token string">&quot;Thread-&quot;</span> <span class="token operator">+</span> <span class="token function">nextThreadNum</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> group<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>group<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> target<span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> group<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>group<span class="token punctuation">,</span> target<span class="token punctuation">,</span> name<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>通过Thread类的源码，我们可以看出，Thread类在进行初始化的时候，都是调用的init()方法，接下来，我们看看init()方法是个啥。</p> <h3 id="init-方法"><a href="#init-方法" class="header-anchor">#</a> init()方法</h3> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">init</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> g<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token keyword">long</span> stackSize<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">init</span><span class="token punctuation">(</span>g<span class="token punctuation">,</span> target<span class="token punctuation">,</span> name<span class="token punctuation">,</span> stackSize<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">init</span><span class="token punctuation">(</span><span class="token class-name">ThreadGroup</span> g<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> target<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">,</span>
                  <span class="token keyword">long</span> stackSize<span class="token punctuation">,</span> <span class="token class-name">AccessControlContext</span> acc<span class="token punctuation">,</span>
                  <span class="token keyword">boolean</span> inheritThreadLocals<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">//线程的名称为空，抛出空指针异常</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>name <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">NullPointerException</span><span class="token punctuation">(</span><span class="token string">&quot;name cannot be null&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
    <span class="token class-name">Thread</span> parent <span class="token operator">=</span> <span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//获取系统安全管理器</span>
    <span class="token class-name">SecurityManager</span> security <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">getSecurityManager</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//线程组为空</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>g <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//获取的系统安全管理器不为空</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>security <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">//从系统安全管理器中获取一个线程分组</span>
            g <span class="token operator">=</span> security<span class="token punctuation">.</span><span class="token function">getThreadGroup</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token comment">//线程分组为空，则从父线程获取</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>g <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            g <span class="token operator">=</span> parent<span class="token punctuation">.</span><span class="token function">getThreadGroup</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token comment">//检查线程组的访问权限</span>
    g<span class="token punctuation">.</span><span class="token function">checkAccess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//检查权限</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>security <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isCCLOverridden</span><span class="token punctuation">(</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            security<span class="token punctuation">.</span><span class="token function">checkPermission</span><span class="token punctuation">(</span>SUBCLASS_IMPLEMENTATION_PERMISSION<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    g<span class="token punctuation">.</span><span class="token function">addUnstarted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//当前线程继承父线程的相关属性</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>group <span class="token operator">=</span> g<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>daemon <span class="token operator">=</span> parent<span class="token punctuation">.</span><span class="token function">isDaemon</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>priority <span class="token operator">=</span> parent<span class="token punctuation">.</span><span class="token function">getPriority</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>security <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> <span class="token function">isCCLOverridden</span><span class="token punctuation">(</span>parent<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>contextClassLoader <span class="token operator">=</span> parent<span class="token punctuation">.</span><span class="token function">getContextClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">else</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>contextClassLoader <span class="token operator">=</span> parent<span class="token punctuation">.</span>contextClassLoader<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>inheritedAccessControlContext <span class="token operator">=</span>
        acc <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">?</span> acc <span class="token operator">:</span> <span class="token class-name">AccessController</span><span class="token punctuation">.</span><span class="token function">getContext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>target <span class="token operator">=</span> target<span class="token punctuation">;</span>
    <span class="token function">setPriority</span><span class="token punctuation">(</span>priority<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>inheritThreadLocals <span class="token operator">&amp;&amp;</span> parent<span class="token punctuation">.</span>inheritableThreadLocals <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>inheritableThreadLocals <span class="token operator">=</span>
        <span class="token class-name">ThreadLocal</span><span class="token punctuation">.</span><span class="token function">createInheritedMap</span><span class="token punctuation">(</span>parent<span class="token punctuation">.</span>inheritableThreadLocals<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">/* Stash the specified stack size in case the VM cares */</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>stackSize <span class="token operator">=</span> stackSize<span class="token punctuation">;</span>

    <span class="token comment">//设置线程id</span>
    tid <span class="token operator">=</span> <span class="token function">nextThreadID</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br></div></div><p>Thread类中的构造方法是被创建Thread线程的线程调用的，此时，调用Thread的构造方法创建线程的线程就是父线程，在init()方法中，新创建的Thread线程会继承父线程的部分属性。</p> <h3 id="run-方法"><a href="#run-方法" class="header-anchor">#</a> run()方法</h3> <p>既然Thread类实现了Runnable接口，则Thread类就需要实现Runnable接口的run()方法，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>target <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        target<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>可以看到，Thread类中的run()方法实现非常简单，只是调用了Runnable对象的run()方法。所以，真正的任务是运行在run()方法中的。另外，<font color="#FF0000"><strong>需要注意的是：直接调用Runnable接口的run()方法不会创建新线程来执行任务，如果需要创建新线程执行任务，则需要调用Thread类的start()方法。</strong></font></p> <h3 id="start-方法"><a href="#start-方法" class="header-anchor">#</a> start()方法</h3> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token comment">//线程不是初始化状态，则直接抛出异常</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>threadStatus <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalThreadStateException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//添加当前启动的线程到线程组</span>
    group<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//标记线程是否已经启动</span>
    <span class="token keyword">boolean</span> started <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
    <span class="token keyword">try</span> <span class="token punctuation">{</span>
        <span class="token comment">//调用本地方法启动线程</span>
        <span class="token function">start0</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//将线程是否启动标记为true</span>
        started <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            <span class="token comment">//线程未启动成功</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>started<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token comment">//将线程在线程组里标记为启动失败</span>
                group<span class="token punctuation">.</span><span class="token function">threadStartFailed</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> ignore<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">/* do nothing. If start0 threw a Throwable then
                  it will be passed up the call stack */</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">private</span> <span class="token keyword">native</span> <span class="token keyword">void</span> <span class="token function">start0</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br></div></div><p>从start()方法的源代码，我们可以看出：<font color="##FF0000"><strong>start()方法使用synchronized关键字修饰，说明start()方法是同步的，它会在启动线程前检查线程的状态，如果不是初始化状态，则直接抛出异常。所以，一个线程只能启动一次，多次启动是会抛出异常的。</strong></font></p> <p>这里，<font color="#FF0000"><strong>也是面试的一个坑：面试官：【问题一】能不能多次调用Thread类的start()方法来启动线程吗？【问题二】多次调用Thread线程的start()方法会发生什么？【问题三】为什么会抛出异常？</strong></font></p> <p>调用start()方法后，新创建的线程就会处于就绪状态（如果没有分配到CPU执行），当有空闲的CPU时，这个线程就会被分配CPU来执行，此时线程的状态为运行状态，JVM会调用线程的run()方法执行任务。</p> <h3 id="sleep-方法"><a href="#sleep-方法" class="header-anchor">#</a> sleep()方法</h3> <p>sleep()方法可以使当前线程休眠，其代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//本地方法，真正让线程休眠的方法</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">native</span> <span class="token keyword">void</span> <span class="token function">sleep</span><span class="token punctuation">(</span><span class="token keyword">long</span> millis<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">sleep</span><span class="token punctuation">(</span><span class="token keyword">long</span> millis<span class="token punctuation">,</span> <span class="token keyword">int</span> nanos<span class="token punctuation">)</span>
    <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>millis <span class="token operator">&lt;</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token string">&quot;timeout value is negative&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>nanos <span class="token operator">&lt;</span> <span class="token number">0</span> <span class="token operator">||</span> nanos <span class="token operator">&gt;</span> <span class="token number">999999</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span>
            <span class="token string">&quot;nanosecond timeout value out of range&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>nanos <span class="token operator">&gt;=</span> <span class="token number">500000</span> <span class="token operator">||</span> <span class="token punctuation">(</span>nanos <span class="token operator">!=</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> millis <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        millis<span class="token operator">++</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
	<span class="token comment">//调用本地方法</span>
    <span class="token function">sleep</span><span class="token punctuation">(</span>millis<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br></div></div><p>sleep()方法会让当前线程休眠一定的时间，这个时间通常是毫秒值，这里需要注意的是：<font color="#FF0000"><strong>调用sleep()方法使线程休眠后，线程不会释放相应的锁。</strong></font></p> <h3 id="join-方法"><a href="#join-方法" class="header-anchor">#</a> join()方法</h3> <p>join()方法会一直等待线程超时或者终止，代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">join</span><span class="token punctuation">(</span><span class="token keyword">long</span> millis<span class="token punctuation">)</span>
    <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
    <span class="token keyword">long</span> base <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">long</span> now <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>millis <span class="token operator">&lt;</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token string">&quot;timeout value is negative&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>millis <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token function">isAlive</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">wait</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token function">isAlive</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">long</span> delay <span class="token operator">=</span> millis <span class="token operator">-</span> now<span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>delay <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">break</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token function">wait</span><span class="token punctuation">(</span>delay<span class="token punctuation">)</span><span class="token punctuation">;</span>
            now <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> base<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">join</span><span class="token punctuation">(</span><span class="token keyword">long</span> millis<span class="token punctuation">,</span> <span class="token keyword">int</span> nanos<span class="token punctuation">)</span>
    <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>millis <span class="token operator">&lt;</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token string">&quot;timeout value is negative&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>nanos <span class="token operator">&lt;</span> <span class="token number">0</span> <span class="token operator">||</span> nanos <span class="token operator">&gt;</span> <span class="token number">999999</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span>
            <span class="token string">&quot;nanosecond timeout value out of range&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span>nanos <span class="token operator">&gt;=</span> <span class="token number">500000</span> <span class="token operator">||</span> <span class="token punctuation">(</span>nanos <span class="token operator">!=</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> millis <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        millis<span class="token operator">++</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token function">join</span><span class="token punctuation">(</span>millis<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">join</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
    <span class="token function">join</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br></div></div><p>join()方法的使用场景往往是启动线程执行任务的线程，调用执行线程的join()方法，等待执行线程执行任务，直到超时或者执行线程终止。</p> <h3 id="interrupt-方法"><a href="#interrupt-方法" class="header-anchor">#</a> interrupt()方法</h3> <p>interrupt()方法是中断当前线程的方法，它通过设置线程的中断标志位来中断当前线程。此时，如果为线程设置了中断标志位，可能会抛出InteruptedExeption异常，同时，会清除当前线程的中断状态。这种方式中断线程比较安全，它能使正在执行的任务执行能够继续执行完毕，而不像stop()方法那样强制线程关闭。代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span> <span class="token operator">!=</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
        <span class="token function">checkAccess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">synchronized</span> <span class="token punctuation">(</span>blockerLock<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">Interruptible</span> b <span class="token operator">=</span> blocker<span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>b <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">interrupt0</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>           <span class="token comment">// Just to set the interrupt flag</span>
            b<span class="token punctuation">.</span><span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token comment">//调用本地方法中断线程</span>
    <span class="token function">interrupt0</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">private</span> <span class="token keyword">native</span> <span class="token keyword">void</span> <span class="token function">interrupt0</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div><h2 id="总结"><a href="#总结" class="header-anchor">#</a> 总结</h2> <p>作为技术人员，要知其然，更要知其所以然，我那个朋友技术本身不错，各种框架拿来就用，基本没看过常用的框架源码和JDK中常用的API，属于那种CRUD型程序员，这次面试就栽在了一个简单的Thread类上，所以，大家在学会使用的时候，一定要了解下底层的实现才好啊！</p> <h2 id="写在最后"><a href="#写在最后" class="header-anchor">#</a> 写在最后</h2> <blockquote><p>如果觉得文章对你有点帮助，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发编程技术。</p></blockquote> <p>最后，附上并发编程需要掌握的核心技能知识图，祝大家在学习并发编程时，少走弯路。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200322144644983.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2wxMDI4Mzg2ODA0,size_16,color_FFFFFF,t_70#pic_center" loading="lazy" class="lazy"></p> <blockquote><p>如果你觉得冰河写的还不错，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「 <strong>冰河技术</strong> 」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「 <strong>冰河技术</strong> 」微信公众号文章，吊打面试官，成功跳槽到大厂；也有不少读者实现了技术上的飞跃，成为公司的技术骨干！如果你也想像他们一样提升自己的能力，实现技术能力的飞跃，进大厂，升职加薪，那就关注「 <strong>冰河技术</strong> 」微信公众号吧，每天更新超硬核技术干货，让你对如何提升技术能力不再迷茫！</p></blockquote> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200906013715889.png" loading="lazy" class="lazy"></p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/binghe001/BingheGuide/edit/master/docs/md/concurrent/source/2020-03-30-017-朋友去面试竟然栽在了Thread类的源码上.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">2022/5/23</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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      </span></p></div> </main></div> <aside class="page-sidebar"> <div class="page-side-toolbar"><div class="option-box-toc-fixed"><div class="toc-container-sidebar"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="max-height:650px"><div style="font-weight:bold;text-align:center;">朋友去面试竟然栽在了Thread类的源码上</div> <hr> <div class="toc-box"><ul class="toc-sidebar-links"><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#前言" class="toc-sidebar-link">前言</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类的继承关系" class="toc-sidebar-link">Thread类的继承关系</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类的源码剖析" class="toc-sidebar-link">Thread类的源码剖析</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类定义" class="toc-sidebar-link">Thread类定义</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#加载本地资源" class="toc-sidebar-link">加载本地资源</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread中的成员变量" class="toc-sidebar-link">Thread中的成员变量</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#线程的状态定义" class="toc-sidebar-link">线程的状态定义</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类的构造方法" class="toc-sidebar-link">Thread类的构造方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#init-方法" class="toc-sidebar-link">init()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#run-方法" class="toc-sidebar-link">run()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#start-方法" class="toc-sidebar-link">start()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#sleep-方法" class="toc-sidebar-link">sleep()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#join-方法" class="toc-sidebar-link">join()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#interrupt-方法" class="toc-sidebar-link">interrupt()方法</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#总结" class="toc-sidebar-link">总结</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#写在最后" class="toc-sidebar-link">写在最后</a><ul class="toc-sidebar-sub-headers"></ul></li></ul></div></div></div></div></div> <div class="option-box-toc-over"><img src="/images/system/toc.png" class="nozoom"> <span class="show-txt">目录</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="max-height:550px"><div style="font-weight:bold;text-align:center;">朋友去面试竟然栽在了Thread类的源码上</div> <hr> <div class="toc-box"><ul class="toc-sidebar-links"><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#前言" class="toc-sidebar-link">前言</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类的继承关系" class="toc-sidebar-link">Thread类的继承关系</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类的源码剖析" class="toc-sidebar-link">Thread类的源码剖析</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类定义" class="toc-sidebar-link">Thread类定义</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#加载本地资源" class="toc-sidebar-link">加载本地资源</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread中的成员变量" class="toc-sidebar-link">Thread中的成员变量</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#线程的状态定义" class="toc-sidebar-link">线程的状态定义</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#thread类的构造方法" class="toc-sidebar-link">Thread类的构造方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#init-方法" class="toc-sidebar-link">init()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#run-方法" class="toc-sidebar-link">run()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#start-方法" class="toc-sidebar-link">start()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#sleep-方法" class="toc-sidebar-link">sleep()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#join-方法" class="toc-sidebar-link">join()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#interrupt-方法" class="toc-sidebar-link">interrupt()方法</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#总结" class="toc-sidebar-link">总结</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html#写在最后" class="toc-sidebar-link">写在最后</a><ul class="toc-sidebar-sub-headers"></ul></li></ul></div></div></div></div></div> <div class="option-box"><img src="/images/system/wechat.png" class="nozoom"> <span class="show-txt">手机看</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="text-align:center"><span style="font-size:0.9rem">微信扫一扫</span> <img height="180px" src="https://api.qrserver.com/v1/create-qr-code/?data=https://binghe001.github.io/md/concurrent/source/2020-03-30-017-%E6%9C%8B%E5%8F%8B%E5%8E%BB%E9%9D%A2%E8%AF%95%E7%AB%9F%E7%84%B6%E6%A0%BD%E5%9C%A8%E4%BA%86Thread%E7%B1%BB%E7%9A%84%E6%BA%90%E7%A0%81%E4%B8%8A.html" style="margin:10px;">
                可以<b>手机看</b>或分享至<b>朋友圈</b></div></div></div></div> <div class="option-box"><img src="/images/system/toggle.png" width="30px" class="nozoom"> <span class="show-txt">左栏</span></div> <div class="option-box"><img src="/images/system/xingqiu.png" width="25px" class="nozoom"> <span class="show-txt">星球</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="text-align:center"><span style="font-size:0.8rem;font-weight:bold;">实战项目<span style="font-size:8px;color:red;">「SpringCloud Alibaba实战项目」</span>、专属电子书、问题解答、简历指导、技术分享、晋升指导、视频课程</span> <img height="180px" src="/images/personal/xingqiu.png" style="margin:10px;"> <b>知识星球</b>：冰河技术
            </div></div></div></div> <div class="option-box"><img src="/images/system/wexin4.png" width="25px" class="nozoom"> <span class="show-txt">读者群</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="text-align:center"><span style="font-size:0.8rem;font-weight:bold;">添加冰河微信<span style="color:red;">(hacker_binghe)</span>进冰河技术学习交流圈「无任何套路」</span> <img src="/images/personal/hacker_binghe.jpg" height="180px" style="margin:10px;">
                PS：添加时请备注<b>读者加群</b>，谢谢！
              </div></div></div></div> <div class="option-box"><img src="/images/system/download-2.png" width="25px" class="nozoom"> <span class="show-txt">下资料</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="text-align:center"><span style="font-size:0.8rem;font-weight:bold;">扫描公众号，回复<span style="color:red;">“1024”</span>下载<span style="color:red;">100GB+</span>学习技术资料、PDF书籍、实战项目、简历模板等「无任何套路」</span> <img src="/images/personal/qrcode.png" height="180px" style="margin:10px;"> <b>公众号:</b> 冰河技术
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